Question: David Ben-Gurion was the signatory of which historical document?
Paraphrase: David Ben-Gurion was the signatory of which authentic document?
SPARQL (Wikidata):  select distinct ?sbj where { ?sbj wdt:P1891 wd:Q37610 . ?sbj wdt:P31 wd:Q3771738 } 
Answer: Declaration of the Establishment of the State of Israel